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Section
2-Valves,
Springs, Guides,
and
Valve
Seat
Inserts
1 1
VAL
SEAT
EXHAUST
VALV
E
SEAT
IN SERT_6057
F
........
VALVE
PORT COUNTER
BORE
1038
Fig. JJ-Correct Valve Seat Width
Fig. J3-Volve Seat Insert
3.
CRANKSHAIT, BEARINGS, AND
PISTON
ASSEMRLlES
The crankshaft
is supported
in
three main
bearings
in the 8-cylinder engines
a
nd
four main bearings in the
6-cylinder engines. The
center
bearings
are
placed
so
that
two
crankshaft
throws
are located
between
any
two
main bearings.
This a rra
ngem ent
provides
a
rigid
sup-
port for the crankshaft and
a llows the
bearing
load to
be distributed.
a. Camshaft.
The
cra
nkshaft
is made
o
f
cast a lloy
steel
with
integral
counterweights
and
is dynamically
a nd
stati-
cally
bala nced.
Oil
di
strib ution
h
oles are
drilled
through
the
shaft
for
main
bearing
and connec
ti
ng
rod
lub ri-
cation. F igure 14
shows these
oil
passages
in a
cutaway
view
of the
R
series
engine
cranksh
a
ft.
(
1) CLEANING AND
INSPECTION.
W
ash
the
Fig. 12-Checking Valve Seat
Runout
crankshaft in solvent. Blowout the
oil
passages with
compressed air.
R
emove
the
sludge trap
plugs
and
clean
out
t he
traps. Press
in
new plugs. Examine
the shaft
for
evidence
of
crac ks.
Check
t he
dowel pins
in
the
fl
ange for looseness.
Remove
any
nicks
on
the ends of
the pins with
a
file.
CAUTION:
Do n ot
file th.e
body
diameter
of th.e
dowel
pins.
(2)
CRANKSHAFT
JOURNAL
MEASURE·
MENT.
M
easure each crankshaft
journal diameter
at
a
minimum of four
places to determi ne
the
size,
whether
or
not
it
is
out of
round,
and
whether
or not
it
h
as
taper.
If
any
of
the
journals
are
out
of
round
more
t
h
a
n
0.0015
inch or if tape
r
of more tha
n 0.001 in ch
exists,
they
sho
uld
be machined.
J
ournals
that
are
worn evenly
and
have
less than
0.001 inch
taper or a
0.0015
inch
out
·
of
round
condition
will
not
require machining
if
the
availa ble
b
eari ngs wi
ll
provide not more than 0.002
inch
clearance for the
main bearing, or
not
more than
0.003
inch
clearance for the
crankpin b
earings.
M
a
nufacturer
's
crankshaft
journ
a
l
diameters
for each
en
gi ne a re given
in Table 4.
SLUDGE
TRAPS
(DRILLED IN
JOURNAL- I
NDIVIDUAL
O
IL
PASSAGES FROM
SLUDGE TRAP
TO EACH
ROI:)
BEARING-PRESSED-IN
HO LLOW PLUGS SEAL OPENINGS.)
1523
Fig
.
'4-Crankshaft Oil
Passag.es
(R
Series
EnginesJ
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